Molding-machine.



W. B. BOLLES.

MOLDING MAGHINB.

APPLIOATION FILED JAN. 1a, 1908.

1,006,053. Patented Oct. 17,1911.

W'i'fine 6'66? 3' m Inventor.

WILLIAM B. BOLLE'S, F CLEVELAND, OHIO.

Application filed January 13, 1908.

Specification of Letters Patent.

MOLDING-MACHINE.

Patented Oct. 17, 1911.

Serial No. 410,669.

i To all whom it may concern:

Be it known that I, WILLIAM B. BOLLES, a citizen of the United States,residing at 5715 Thackeray avenue, southeast, in the city of Cleveland,county of Cuyahoga, and State of Ohio, have invented a new and usefulMolding-Machine, of which the following is a specification.

The primary object of the invention is to provide a machine in whichcement building blocks of desirable shape may be formed and from whichthey may be removed easily, quickly and without injury, said machinebeing capable of being easily changed so that the blocks made thereinwill be of various sizes.

In the drawing, the figure is an isometric view of a machine embodyingthe invention, the right end plate being closed and the left end plateopen.

The bed plate or table top A is fixed upon legs 13, B, suitablyconnected by brace rods Z), 6.

D, D represent respectively the front and back mold plates, and F, Frepresent the end mold plates. hen the mold is closed and ready toreceive the material from which a building block is to be formed, thesefour plates stand in substantially vertical positions, the side edges ofthe plates F fitting in vertical grooves 0 in the ends of the front andback plates. It is a matter of no consequence to the present inventionwhether the back late D is fixed permanently in the descri ed verticalposition, or whether it be connected with the bed plate A bysubstantially the same means which are shown for connecting the frontplate D thereto.

Hinge arms C, G, are rigid with the front plate D, and with each of theend plates F, and extend from the outer faces thereof in a downwardlyand outwardly direction. Two arms a project outwardly from the bed A,and in each of these arms are several holes d. A rod p by enteringsuitable holes in these two arms and in the hinge arms of plate Dpivotally connect said plate to the bed of the machine. Similar rods pare employed for pivoting the hinge arm G of the end plates F, F, tocorresponding arms (Z projecting laterally from the plate A,said armshaving a plurality of holes (Z, cl.

Each end plate F, F, is provided with outwardly extended lugs m in whicha horizontal rock shaft 72. is mounted, said rock shaft being providedwith an operating handle 9 fixed to it. On each end of each rock shaft his an arm a having at its end an inwardly turned finger a which providesa shoulder adapted for engagement severally with the curved outwardlyprojecting lugs f on the front and rear plates D, D respectively, thecurved faces of these lugs being slightly eccentric with respect to theaxis of shaft 7t when the end plates are closed.

In using the described machine, the operator gets the plates D and Dinto vertical position. He then swings the end plates into verticalposit-ion, and then by turning the rock shaft h brings about a suitableengagement between the shoulders on the arms a and the curved lugs fwhereby the end plates are drawn in tightly and held in place. The innerfaces of the arms a by their engagement with the outer faces of the lugsf likewise hold the front plate D from swinging forward, and the backplate D from swinging rearward, if it be a hinged plate.

Upon the inner face of each end plate is a core G, which may be formedas a part of the plate or fixed thereto by any suitable means. Each coreis of progressively and regularly smaller area in horizontal sectionfrom its top downward. The shape of the core in horizontal sectionshould be a semicircle or semi-ellipse, or a parabola, or some formapproximately these. The base of the core,-,thatis to say, the plane inwhich it joins plate F, must be as wide as the core is at any place, inthe same horizontal plane, and should be preferably a trifle wider therethan anywhere else. \Vhen the core is shaped as described, the blockmade in the mold is of peculiar and desirable shape. It is evident thatwhen the cores are shaped as described, the smallest outward movement ofthe end plates on their hinge axes will completely separate the corefrom cont-act with the block.

An off bearing plate H forms the bottom of the mold, and rests upon thetop of the bed plate A,'and the finished block is removed with thisplate H, while the mold is open; and that another plate H isput in placebefore the mold is closed. The lower edges of the mold plates, D, D, F,F, when the mold is closed, are approximately in the plane of the topsurface of the plate H. Therefore plates H of one size may be usedwhether the mold be adjusted for making blocks of one size oranother,because when the mold plates are hinged so as to make smallblocks, the lower edges of said plates when closed lie close to the topsurface of said plates H,-the edges of said plate II extending a greateror less distance under said mold plates.

Having described my invention, I claim:

In a block-molding machine, the combination of a bed having an integralback and pairs of arms extending from its front edge and each of its endedges with front and end plates hinged respectively to said pairs ofarms and adapted when closed to form an open-top mold, rook shaftsmounted near the upper edges of the end plates, arms on the extendingends of the shafts having inturned toes on their free ends, andeccentrically curved ribs on the front and back plates of the moldadapted to be engaged by the toes on said arms, whereby the end platesare drawn into close clamping contact with the ends of the front andback plates with means for rocking said shafts.

WILLIAM B. BOLLES.

Witnesses:

CLIFTON H. JENKs, OLIVER R. CLARK.

Copies of this patent ma; be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, I). 0.

